When you use PDO, try to get

 fetchAll(PDO::FETCH_ASSOC)

 fetch(PDO::FETCH_ASSOC)

return is Array. This Array have rows, it’s mean :

array[0] = array[“field1”, “field2”, “field3”]
array[1] = array[“field1”, “field2”, “field3”]
……
array[10] = array[“field1”, “field2”, “field3”]

So get array index or row maybe not exist, when you try to get value, get error code.

You can try to make two function:

function ar_get($val, $ar){
return array_key_exists($val, $ar)?$ar[$val]:"";
}

  function crud_ar_get($val, $ar, $rec_arrow=0){
return (isset($ar[$rec_arrow]))?ar_get($val, $ar[$rec_arrow]) : “";
  }

Example 1：

ar_get for array get value

$prduct = array(“product_name”=>“a”, “product_price=>“100”);

ar_get(“product_name”, $product);
ar_get(“product_price”, $product);

If no index, just return "”

Example 2：

crud_ar_get for array get value

$prduct[0] =  array(“product_name”=>“a”, “product_price=>“100”);
$prduct[1] =  array(“product_name”=>“b”, “product_price=>“200”);

crud_ar_get(“product_name”, $product);  // a
crud_ar_get(“product_price”, $product);  // 100

crud_ar_get(“product_name”, $product, 1);  // b
crud_ar_get(“product_price”, $product, 1);  // 200

If no offset, just return "”

This way can avoid  Warning Message.  For small website.

BUT performace…… maybe no good..